must destabilise
Regular verb: destabilise - destabilised- destabilised

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must destabilise
you must destabilise
he must destabilise
we must destabilise
you must destabilise
they must destabilise 	I must be destabilising
you must be destabilising
he must be destabilising
we must be destabilising
you must be destabilising
they must be destabilising	I must have destabilised
you must have destabilised
he must have destabilised
we must have destabilised
you must have destabilised
they must have destabilised	I must have been destabilising
you must have been destabilising
he must have been destabilising
we must have been destabilising
you must have been destabilising
they must have been destabilising	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not destabilise
you must not destabilise
he must not destabilise
we must not destabilise
you must not destabilise
they must not destabilise 	I must not be destabilising
you must not be destabilising
he must not be destabilising
we must not be destabilising
you must not be destabilising
they must not be destabilising	I must not have destabilised
you must not have destabilised
he must not have destabilised
we must not have destabilised
you must not have destabilised
they must not have destabilised	I must not have been destabilising
you must not have been destabilising
he must not have been destabilising
we must not have been destabilising
you must not have been destabilising
they must not have been destabilising	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I destabilise?
must you destabilise?
must he destabilise?
must we destabilise?
must you destabilise?
must they destabilise? 	must I be destabilising?
must you be destabilising?
must he be destabilising?
must we be destabilising?
must you be destabilising?
must they be destabilising? 	must I have destabilised?
must you have destabilised?
must he have destabilised?
must we have destabilised?
must you have destabilised?
must they have destabilised? 	must I have been destabilising?
must you have been destabilising?
must he have been destabilising?
must we have been destabilising?
must you have been destabilising?
must they have been destabilising? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not destabilise?
must you not destabilise?
must he not destabilise?
must we not destabilise?
must you not destabilise?
must they not destabilise? 	must I not be destabilising?
must you not be destabilising?
must he not be destabilising?
must we not be destabilising?
must you not be destabilising?
must they not be destabilising? 	must I not have destabilised?
must you not have destabilised?
must he not have destabilised?
must we not have destabilised?
must you not have destabilised?
must they not have destabilised? 	must I not have been destabilising?
must you not have been destabilising?
must he not have been destabilising?
must we not have been destabilising?
must you not have been destabilising?
must they not have been destabilising?